TRANSACTIONS OF THE SECTIONS. 29 
2. The mean of each day of the month. 
3. The same two means for each period of ten days. 
4. The mean range for the month, and for each ten days; the extreme 
range, &c. 
2nd, in “ Pressure.” 
1. The pressure of each hour for the month. 
2. The mean pressure of each day of the month. 
3. The same two means for each period of ten days, 
4. The maximum and minimum pressure of each day, with the extreme va- 
riation for each day ; the maximum and minimum pressure of the month, 
with the extreme variation for the month, &c. 
5. The four semi-oscillations for each 24 hours, with the mean values of 
them for the month. 
3rd, in “ Humidity.” 
1, The temperature of the air each hour (repeated from the register of tem- 
perature). 
2. The depression of the wet-bulb thermometer for ditto. 
3. The dew-point for each hour, calculated from Professor Apjohn’s formula, 
disregarding his correction for pressure. 
4. The mean of all these for each day. 
5. The quantity of rain for each twelve hours. 
Besides these monthly registers, the author exhibited two tables drawn 
- up in the form first adopted by Sir David Brewster, showing for the 
complete year of the observations, viz. from June 1837 to June 1838, 
Ist, The daily and monthly mean temperature. 
2nd, The mean temperature of each hour for | from 8760 obser- 
each month, and for the whole twelve vations. 
months. 
Also two other tables, showing for the same period, 
Ist, The daily and monthly dew-points. 
2nd, The mean dew-point of each hour for 
each month, and for the whole twelve ditto. 
months. 
The first two tables give for the mean temperature of the station 
78°89, and the other two give for the mean dew-point 71°78. 
The barometric registers give by a mean of all the diurnal semi- 
oscillations for the same period the following results : 
Fall between 10 a.m. and 4.p.M. 0°109 inch. 
Rise 4. P.M. 10 p.m. 0°108 
Fall 10 P.M. 4 a.m. 0:071 
Rise 4am. l0aA.M. 0:073 
Times of maxima between the hours of 9 and 10 morning and evening. 
Times of minima between those of 3 and 4 afternoon and morning. 
Mr. Caldecott concluded his communication by noticing that he was 
about to return to his post in India amply furnished with meteoro- 
logical, magnetical, and astronomical instruments, and added that, 
should the committee of the Physical Section of the British Association 
see fit to honour him with any suggestions as to points in meteorology, 
or any other branch of the physical sciences which his local situation 
